etc-gentoo/init.d/._cfg0001_mtab

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#!/sbin/openrc-run
# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.
description="Update /etc/mtab to match what the kernel knows about"
depend()
{
need root
keyword -prefix -systemd-nspawn
}
start()
{
[ -L /etc/mtab ] && return 0
local rc=0
ebegin "Updating /etc/mtab"
if ! checkpath -W /etc; then
rc=1
elif [ ! -e /etc/mtab ]; then
ln -snf /proc/self/mounts /etc/mtab
else
ewarn "The support for updating /etc/mtab as a file is"
ewarn "deprecated and will be removed in the future."
ewarn "Please run the following command as root on your system."
ewarn
ewarn "ln -snf /proc/self/mounts /etc/mtab"
ewarn
# With / as tmpfs we cannot umount -at tmpfs in localmount as that
# makes / readonly and dismounts all tmpfs even if in use which is
# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts
# which allows this hack to work.
grep -v "^[! ]* / tmpfs " /proc/mounts > /etc/mtab
# Remove stale backups
rm -f /etc/mtab~ /etc/mtab~~
fi
eend $rc "/etc is not writable; unable to create /etc/mtab"
return 0
}